Impeovement ie attachment foe base-dyes dooes



S.4 MORTON. Stove-Doni` Guard.

Patented June 9, 1868.V

l l l I l aM/ML N. FEI'ERS. PHOTQUTHOGRAPNER. WASHINGYON, D. Cy

@auch latte'- atmt @frn Letters Patent No. 78,754, dated Jtmc 9,1868.'

IMPROVEMENT IN ATTACHMENT POR BAKE-:OVEN DOORS.

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TO ALL WHOM IT MAY GONCERN:

Be it known that I, SMITH MORTON,-of the city of Valparaiso, in the county of Porter, in tbe State of Indiana., have invented a new and improved Mode of Preventing Articles from Burning in Ovens while Baking; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon. i

The nature of my invention consists in so hanging the oven-door, that when free to move, its weight, or a spring, will cause it to open. It is to be provided with a movable latch or catch, some part of which 'is to be inserted in a fusible metal or metallic alloy, so that when the metal is not fused tbelatch or catch is stationary, and when the door` is closed thc oatch'will hold it firmly to its place until the oven shall have attained a given degree of heat, when the metal will fuse, and allow the latch or catch to turn and loosen its hold,I andthe spring or weight to open the door. I also attach an alarm, which is moved by a weight or spring, and may be such as risrused in clocks, or any ordinary alarm, which is to `be held-motionless by some part of it being inserted in said fusible metalor metallic alloy, so that when fused by a given'degree of heatattained by the oven, it will give notice by sounding an alarm, said metal or metallic alloy being so attached to the alarm that when not fused it is held from sounding.

To enable others skilled in the art to make and use my'invention, I will proceed to describe its construe tion and operation. i

I take, any ordinary oven, such as is found in the cooking-stoves-of tbe day,of which Figure 1, in the accompanying drawing, isV the side of the oven with the door closed. I I

I is a spring, by which the door is opened', Huthehinges, and P a point, upon which the latch fastens. 'a is the catchgb, a cup, ito hold the fusible metal or metallic alloy; Lraavire, running from the catch into the metal in the cup.` When the heat of the oven is suilicient to melt the metal, the spring I will cause the catch a to turn and the door to open.

Figures 2 and 4 represent th'e alarm. I o

b is a cup, containing the metal or alloy; g, a wire from shaft which drives the hammer K. Itis inserted in the cup b', whichconta'ins the metal. When the metal is melted, and the alarm .wound up, it will notify those in charge of the heat of the oven.

"In general I compose-this fusible metal of tin and bismuth, in such proportion as will insure its melting at a given temperature, which must be that at or immediately before that at which the article being baked will burn.

For ordinary baking, I use twelve partsitin to one of bismuth, but the` proportion is to be varied as the taste of thosofor whom the baking is donc, some choosing articles cooked with more heat than others.

When the temperature in an oven thus arranged reaches a point at which the article being baked will burn,

the metal will fuse, and the door open,` and the alarm notify those in charge, thereby 4avoiding all danger ofthe article burningf Y f What I claim as my invention, and'desireto secure by Letters Patent, is-

The application, to the doors of ovens, of a latch or catch, held immovable by the within-described metal or metallic alloy while it is unfused, but which, when the said metal is fused, turns and unfastens itself, in combif nation with a weight or spring, to open the door, and the fusible metal and alarm on the inside of the oven, substantially as shown and described.

SMITH MoRToN.

Witnesses:

CHARLES N. Memoir, J. J. CARPENTER. 

